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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Jun. 30, 2012
Commitments and Contingencies (Textual) [Abstract] |
Commitments and Contingencies, additional bonding capacity | $ 377.3
Commitments and Contingencies, facility agreement | 11.7
Secured and Unsecured Letter of Credit [Member] |
Commitments and Contingencies (Additional Textual) [Abstract] |
Loss contingency, estimate of possible loss | 41.1
Performance and Maintenance Bonds [Member] |
Commitments and Contingencies (Additional Textual) [Abstract] |
Loss contingency, estimate of possible loss | 222.7
Guarantee Obligations [Member] |
Commitments and Contingencies (Additional Textual) [Abstract] |
Loss contingency, estimate of possible loss | $ 8.5

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- Definition Commitments and contingencies additional bonding capacity. + References No definition available. + Details
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Namespace Prefix: | powl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | powl_CommitmentsAndContingenciesAdditionalTextualAbstract
Namespace Prefix: | powl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Commitments and contingencies facility agreement. + References No definition available. + Details
Name: | powl_CommitmentsAndContingenciesFacilityAgreement
Namespace Prefix: | powl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | powl_CommitmentsAndContingenciesTextualAbstract
Namespace Prefix: | powl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant